Kazumi was shown to be a loving and kind person who enjoys spending time together with his fiancé. Despite his grief over her disappearance, he was shown to be quite trusting. Upon learning that she was in fact dead and Tanjiro had encouraged him to move on, Kazumi became upset and asked how he could know his pain, only to quickly realize his savior did indeed endure a terrible loss as well, becoming regretful of his harsh words. Unlike most civilians, Kazumi seems to know some knowledge about demons and Demon Slayers, having heard about their existence through rumors, though he remains surprised to see them in reality.

I don't have a set voice for him but would like him to have a medium-pitched voice as he is a teenager.